/**
* Performs the soaprequest
*
* @param OperationInterface $operation The operation
* @param array $params Requestparameters 'ParameterName' => 'ParameterValue'
*
* @return array The response as an array with stdClass objects
*/
protected function performSoapRequest(OperationInterface $operation, $params)
{
$soapClient = new \SoapClient($this->webserviceWsdl, array('exceptions' => 1));
$soapClient->__setLocation(str_replace('%%COUNTRY%%', $this->configuration->getCountry(), $this->webserviceEndpoint));
$soapClient->__setSoapHeaders($this->buildSoapHeader($operation));
return $soapClient->__soapCall($operation->getName(), array($params));
}